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`impl Trait` types cannot appear nested in the generic arguments of other
`impl Trait` types.
Erroneous code example:
```compile_fail,E0666
trait MyGenericTrait<T> {}
trait MyInnerTrait {}
fn foo(
bar: impl MyGenericTrait<impl MyInnerTrait>, // error!
) {}
```
Type parameters for `impl Trait` types must be explicitly defined as named
generic parameters:
```
trait MyGenericTrait<T> {}
trait MyInnerTrait {}
fn foo<T: MyInnerTrait>(
bar: impl MyGenericTrait<T>, // ok!
) {}
```
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